KR20120098983A - Method and device for providing information by using reflective display - Google Patents

Abstract

PURPOSE: An information providing method using a reflective display and a device thereof are provided to display at least one of the color of an electrophoretic particle and the color of a solvent. CONSTITUTION: An electrophoretic particle is dispersed in a solvent. A film includes the electrophoretic particle and the solvent. The film is made in at least one of a partition wall structure and a capsule structure. An electric field applying unit applies an electric field to at least one portion of the film. At least one of the color of the electrophoretic particle and the color of the solvent is displayed by adjusting the location of the electrophoretic particle in the film.

Description

Method and device for providing information using reflective display {METHOD AND DEVICE FOR PROVIDING INFORMATION BY USING REFLECTIVE DISPLAY}

The present invention relates to a method and an apparatus for providing information using a reflective display.

Generally, light emitting devices such as LCDs and LEDs are used for advertisement / publicity displays, but such displays have a disadvantage in that sharpness is sharply reduced outdoors, installation and maintenance costs are high, and power consumption is high. Therefore, recently, researches for developing outdoor advertising / publicity displays using active displays such as electronic papers used in the field of electronic books have been actively conducted.

As a technique of using a reflective display, a technique of controlling and displaying particles using the principle of electrophoretic, a technique of moving and displaying liquid by using electrowetting, and an interference phenomenon of light Although a variety of techniques have been introduced, such as a technique for adjusting and displaying a fine lattice structure using a photonic crystal and a technique for displaying using a photonic crystal, a technique using particles among them is most widely used.

Representative reflective display technology using particles is a technology called EPD (ElectroPhoretic Display), which disperses particles charged on the surface in an insulating solvent and applies an electric field from the outside, Adjust the position so that the unique color of the particles is displayed. According to the EPD, it is possible to control the color of the light reflected from the particle, ie the reflected light, by dispersing the colored particles in a clear solution and adjusting the position of the colored particles or by dispersing the particles in the colored solution and adjusting the position of the particles.

An object of the present invention is to provide a method and apparatus for providing information using a reflective display.

According to the present invention, an information providing method and apparatus using a reflective display are provided.

According to the present invention, it is possible to provide a method and apparatus for providing information using a reflective display.

DETAILED DESCRIPTION The following detailed description of the invention refers to the accompanying drawings that show, by way of illustration, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that the various embodiments of the present invention are different, but need not be mutually exclusive. For example, certain features, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the invention in connection with an embodiment. It is also to be understood that the position or arrangement of the individual components within each disclosed embodiment may be varied without departing from the spirit and scope of the invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is to be limited only by the appended claims, along with the full scope of equivalents to which such claims are entitled, if properly explained. In the drawings, like reference numerals refer to the same or similar functions throughout the several views.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention.

[Film Formation Method of Display Device]

According to one embodiment of the present invention, in order to make an electronic billboard using a solution (electron ink) in which particles (or nanoparticles) are dispersed, it is necessary to process the solution in the form of a film. It should be sealed by the method.

As the sealing method according to the present invention, a method of encapsulating the solution in a light-transmissive medium or a method of sealing the solution using a fine bulkhead structure may be generally used.

First, when filming is performed using the double fine bulkhead structure, the following method may be applied:

A method of fabricating fine bulkhead structures using conventional lithography patterning techniques.

A method of fabricating a fine bulkhead structure by imprinting a predetermined shape using a printing process such as gravure.

-A method of manufacturing a fine bulkhead structure using a film having a certain pattern, such as a prism sheet that is mass produced for a conventional LCD display (that is, placing a patterned sheet on the electrode, and thus Method of injecting ink (solution) after sealing the formed pattern forming plate as a transparent electrode (i.e., upper plate)

-The method of manufacturing the fine barrier rib structure in advance and placing it between the upper and lower plate electrodes, and then sealing the upper and lower plate electrodes to the fine barrier plate while injecting a solution.

-A method of manufacturing a micro-barrier structure by placing a structure having micropores between electrodes (that is, placing a plate having micropores made of a light transmissive material between upper and lower electrodes, and injecting a solution between the micropores to form a micro-barrier structure) To form).

-A method of manufacturing a fine bulkhead structure by placing a thin tube or the like between the upper and lower electrodes (i.e., a method of manufacturing a fine bulkhead structure by injecting a solution into a glass pipe, a plastic pipe, etc., and then placing the pipe between the upper and lower electrodes).

In the above method, a method of manufacturing a fine partition structure by injecting a solution before sealing or preparing a pre-sealed film and then injecting the solution using capillary action, electrowetting, barometric pressure difference, and the like.

A method of improving the function as a reflective display by adding a substance capable of maximizing the intensity (ie reflectivity) of the reflected light to the fine partition structure.

UV curable coating on the surface of the micro-barrier structure, followed by sealing with irradiation of UV in the process of injecting the solution and covering the upper electrode.

Next, when producing a film by encapsulating in a light transmitting medium, the following method may be applied:

-After mixing the soft capsule with the binder and applying it on the lower electrode, the binder is hardened for a certain time or more so that the capsules can be closely adhered to each other.

-Method of manufacturing by mixing UV blocker with binder or capsule material to increase UV stability of electronic paper.

-Applying the adhesive on the capsule and then attaching the release film, or attaching the adhesive applied release film on the capsule.

-A method of coating a binder and a pressure-sensitive adhesive into a one-component solution and coating them simultaneously.

-How to increase the temperature increase rate step by step more than two steps to ensure the stability of the capsule when drying

A method of adding a moisture resistant reinforcing film to the lower electrode plate after fabricating the film in order to improve the moisture resistance. At this time, a method of using a metal film such as aluminum (Al) as the moisture resistant film.

-Method of improving visibility by applying antireflective coating on the surface of upper electrode after making film

A method of increasing the reflectivity of external reflected light by applying a reflective coating between the lower electrode or the lower electrode and the capsule.

[Color implementation method]

In order to apply a reflective display to an advertisement display, a method of displaying color is required. In general, color is displayed by placing a color filter or a color printing film on the reflective display.

According to an embodiment of the present invention, various color display methods may be used as follows.

First, the case of making a film through encapsulation is described:

By placing different kinds of capsules, each of which can display different colors, in different positions, thereby implementing a variety of color representations (i.e., selectively applying a specific color capsule to the area to which a particular color is to be implemented); .

A method of implementing color display by passing various color capsules through a film in which a pattern capable of selectively passing the capsule is formed in advance, such as screen printing.

A method of selectively attaching the color capsules to the patterned irregularities such as gravure offset.

A method of applying the capsule only to certain areas of the membrane which have affinity with the capsule, enhancing the hydrophilic / hydrophobic properties of the capsule surface and patterning the membrane so that the membrane partially has hydrophilicity / hydrophobicity.

-Applying capsules with UV curable binder, irradiating UV to specific areas to harden the capsules and removing remaining capsules by washing etc.

A method of color realization, in which a film is formed of a single color or colorless capsule or fine bulkhead structure or the like and then the capsule or fine bulkhead structure of a specific area of the film is exposed to a dye.

As a color implementation method using capsules, a mixed color may be implemented by mixing capsules made of different colors. In other words, the electronic ink color in the capsule may be individually controlled, but instead, by physically mixing (i.e., placing in close proximity to) several color capsules having different colors, microscopically different colors may be present. Colors that are displayed individually but may be mixed with different colors may be displayed macroscopically.

-Color capsules or Cyan, Magenta, Yellow, which can selectively display Red, Green, and Blue, respectively, depending on the direction or intensity of the applied electric field; ) After producing color capsules capable of selectively displaying each color or color capsules capable of selectively displaying red, blue, and yellow, respectively, and mixing these color capsules, various colors can be realized according to the mixing ratio. Here, the red color capsule refers to a capsule in which the color changes as an electric field is applied, but at least red color is displayed during the change.

-Brightness or saturation of the displayed color can be adjusted by appropriately applying the capsule that can display only black and white on the color capsule directly above.

Next, a case of manufacturing a film using a fine bulkhead structure will be described.

A method of implementing various colors by placing solutions displaying different colors in different areas.

-How to realize various colors by vertically stacking films that implement different colors

In the color implementation method described above, when a special material such as fluorescent material, phosphorescent material, light emitting material, OVP (Optical Variable Pigment), cyan dye (material that changes color depending on temperature) is added, Since the visual effect can be expressed, it can be effectively used in advertisement / promotional display. According to one embodiment of the invention, the special material as described above may be contained in the ink or in a material for sealing, such as a capsule or a partition.

Meanwhile, as a color implementation method, a method of displaying a specific color by attaching an electronic paper already made of a film only to an area to implement a specific color may be considered.

[Device driving method]

In general, in a reflective display for an eBook, the ability to maintain the display state even when the power is turned off (bistability) is very important. Therefore, a technique is applied such that the display state can be maintained even when the power is turned off by adjusting the viscosity of the solution, the density of the constituent materials, the surface of the particles, and the like.

In contrast, in advertising / promotional displays, the ability to attract people's attention as the information displayed changes rapidly is more important than the ability to maintain the display state. Various methods can be used to mitigate and achieve high operating speeds.

-In the case of EPD using particles, the size of the particles is smaller than the EPD for eBook, the viscosity of the solvent is minimized, and the surface charge or zeta charge of the particles is increased to speed up the operation speed.

On the other hand, when there is no bistable (bistability), the following method can be used to prevent the deterioration phenomenon due to leakage current as a specific voltage for generating an electric field is applied in the same direction for a long time. That is, a method of intermittently applying an electric field of a specific direction and intensity for displaying a specific color according to a short period may be used. If a certain voltage is continuously applied for a long time, deterioration may occur due to leakage current. Therefore, if a specific voltage and a lower voltage (or the opposite voltage) are mixed at short time intervals and alternately applied at high speed, By minimizing the movement of the eye, deterioration can be effectively prevented while keeping the color visible to the naked eye.

A method of maintaining a certain color, such that a capacitor is attached to each pixel (or display segment) so that a constant voltage is maintained by the capacitor even when the power is turned off and no voltage is applied, or refreshing the DRAM. How to recharge the capacitor at regular intervals as shown.

A method of controlling the degree of color change by adjusting the intensity of the voltage (i.e. the strength of the electric field applied to the particle) (e.g. dispersing white charged particles in a red solvent, the charged particles in accordance with the applied electric field strength) Since the degree of movement of is different, it is possible to control the degree to which the red color of the solvent and the white color of the charged particles are mixed by controlling the intensity of the voltage corresponding to the electric field).

A method of controlling the degree of color change by adjusting the application period (or the number of application times) of the human being intermittently applied (e.g., when white charged particles are dispersed in a red solvent, Since the degree of movement varies, the degree of mixture of the red color of the solvent and the white color of the charged particles can be controlled by adjusting the application period of the voltage corresponding to the electric field.)

-When two or more electric fields are mixed and applied, a method of controlling color by adjusting the intensity of two or more electric fields, respectively.

-When two or more electric fields are mixed and applied, a method of controlling color by adjusting the time when two or more electric fields are applied.

-When two or more electric fields are mixed and applied, a method of adjusting color by adjusting the number (or cycles) of two or more electric fields being applied.

-When applying an alternating voltage as a voltage corresponding to an electric field, adjusting the color by adjusting at least one of the amplitude or offset of the alternating voltage.

[How to make module]

According to one embodiment of the invention, the advertising / promotional display product may be produced by adhering the film produced as described above to a lower substrate having a predetermined pattern, the following method may be applied:

A method of using a PCB circuit board which is widely used as a lower board.

A method of using a flexible PCB substrate for fabricating a flexible display as the underlying substrate.

-In order to improve the moisture resistance / impact resistance, etc., at least one of the lower substrate and the upper substrate is manufactured by additionally coating the moisture / impact resistant film.

-Method of producing unit pixel (Pixel) with size of 1mm or more and 1cm or less (In e-books, it is necessary to realize high-definition image using TFT active array, but for outdoor advertising / publicity display, unit pixel size should be more than 1mm Even high-definition display for users who see from a relatively long distance).

In the case of an advertisement / promotion display, since the pattern to be displayed is not many and the display state is only partially changed, an electrode is used in units of segments including a plurality of pixels rather than pixels. How to drive.

-In order to minimize manufacturing cost, metal plate or conductive plate is patterned and used as electrode.

[System production]

According to an embodiment of the present invention, since the reflective display does not require a separate light source and has an excellent form factor, the reflective display may be processed into various forms according to various methods as follows:

-Partial display by attaching a reflective display to only a portion of a paper advertisement / publicity, such as an existing catalog or poster.

-A method of implementing a 3D type display that displays various information when popped up by attaching a reflective display of different colors to a specific portion of an advertisement / publicity such as a conventional pop-up card.

-By combining a light emitting display such as a conventional LCD / OLED and a reflective display according to the present invention, a low-resolution information in units of segments is displayed by using a reflective display on a large screen, and LCD / OLDE, etc. in a specific area. Method of displaying high-definition information in fine pixel units using the light emitting display of the.

-The appearance of the reflective display is processed and shaped similarly to the shape of natural objects (e.g., trees, flowers, butterflies, peacocks, etc.) or products to be advertised (e.g., drinks, handbags, notebooks, etc.). How to maximize the promotional effect (e.g., make a reflective display in the shape of a tree and display the information in the leaves, stems, etc. of the reflective display, or in the shape of a beverage container Logo part can be made as a reflective display to highlight the logo).

A method of displaying specific information or patterns by attaching a reflective display to a specific location of a product (eg clothing, furniture, tiles, windows, wallpaper, electronics, shoes, watches, etc.).

A method of displaying information on both the front and the back of the reflective display, that is, forming reflective films on the upper and lower portions of the electrode substrate having electrodes formed on both sides, and forming an upper electrode on each of both sides of the electrode substrate; Using a transparent electrode as the upper and lower electrodes so that information is displayed through both the upper and lower surfaces.

-How to make a reflective display in a three-dimensional shape (for example, to form a structure in 3D after cutting in the form of a pop-up card, spiral, etc.)

-LGF (Light Guide Film) or a separate auxiliary light is mounted on the surface of the reflective display to transmit information even in the dark.

A method of fabricating a reflective display module in combination with a power supply such as a solar cell.

-Method of manufacturing the reflective display module combined with the touch sensor.

A method of combining a reflective display module with a wireless communication means to operate without a separate wire.

-A method of manufacturing a reflective display having a large area or three-dimensional structure by connecting and combining a plurality of reflective display modules.

In the present invention as described above has been described by the specific embodiments, such as specific components and limited embodiments and drawings, but this is provided to help a more general understanding of the present invention, the present invention is not limited to the above embodiments. For those skilled in the art, various modifications and variations are possible from these descriptions.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (10)

By controlling the position of the electrophoretic particles in the film by adjusting the electric field applied to at least a portion of the film comprising the electrophoretic particles and the solvent and consisting of at least one of the partition structure and the capsule structure, At least one color of the color of the electrophoretic particles and the color of the solvent is displayed. The method of claim 1,
At least one color filter is disposed on at least a portion of the film, or the electrophoretic particles comprise at least two or more electrophoretic particles having different colors. The method of claim 1,
By controlling the movement resistance of the electrophoretic particles in the solvent, the position of the electrophoretic particles in the film is maintained for a predetermined time or more within a predetermined range even after the electric field is blocked. Method of providing information using a display type. The method of claim 1,
And at least one of a direction, an intensity, an application time, an application period, and an electric force line pattern of the electric field is adjustable. The method of claim 1,
An information providing method using a reflective display, characterized in that the electric field is applied in units of segments including a plurality of pixels. Electrophoretic particles,
A solvent in which the electrophoretic particles are dispersed,
A film comprising electrophoretic particles and a solvent and composed of at least one of a partition structure and a capsule structure, and
Electric field applying unit for applying an electric field to at least a portion of the film
Including,
And adjusting the position of the electrophoretic particles in the film by adjusting an electric field so that at least one of the color of the electrophoretic particles and the color of the solvent is displayed. The method of claim 6,
At least one color filter is disposed on at least a portion of the film, or the electrophoretic particles include at least two or more electrophoretic particles having different colors. The method of claim 6,
By controlling the movement resistance of the electrophoretic particles in the solvent, the position of the electrophoretic particles in the film is maintained for a predetermined time or more within a predetermined range even after the electric field is blocked. Information providing apparatus using a type display. The method of claim 6,
At least one of a direction, an intensity, an application time, an application period, and an electric force line pattern of the electric field is adjustable. The method of claim 6,
An information providing apparatus using a reflective display, characterized in that the electric field is applied in units of segments including a plurality of pixels.